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Broadcast Approach to Uplink NOMA: Queuing Delay Analysis.

Maha Zohdy1, Ali Tajer1, Shlomo Shamai Shitz2

  • 1Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.

Entropy (Basel, Switzerland)
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel multi-access broadcast approach for wireless networks, significantly reducing latency by adapting data layers to channel conditions. This method minimizes re-transmissions and improves overall performance, especially under high traffic loads.

Keywords:
broadcast approachchannel state informationlatencymultiple access

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Area of Science:

  • Wireless Communication
  • Information Theory
  • Network Engineering

Background:

  • Emerging wireless technologies demand low latency and high reliability.
  • Non-orthogonal multiple access (NOMA) offers grant-free transmission but faces frequent outages in open-loop systems.
  • Outages cause re-transmissions, increasing latency.

Purpose of the Study:

  • To propose a multi-access broadcast approach for enhanced wireless transmission.
  • To reduce latency and prevent outage events in grant-free NOMA systems.
  • To analyze the average queuing delay under different arrival processes.

Main Methods:

  • A multi-access broadcast approach where users split data into channel-state-adapted layers.
  • Analytical characterization of delay bounds for deterministic arrivals.
  • Delineation of average delay using the Pollaczek-Khinchin formula for Poisson arrivals.

Main Results:

  • The proposed layered approach prevents outage events, unlike single-layer methods.
  • Closed-form bounds and expressions for average queuing delay were derived.
  • The approach achieves lower average delay compared to traditional outage methods.

Conclusions:

  • The multi-access broadcast approach significantly minimizes average sum delays.
  • Optimal power allocation further enhances delay reduction, particularly at high arrival rates.
  • This method is a promising solution for low-latency, high-reliability wireless applications.